目的 研究贡山三尖杉Cephalotaxus lanceolata枝叶的化学成分.方法 运用硅柱色谱、凝胶柱色谱、中压制备液相、高压制备液相等方法进行分离纯化,通过波谱技术和和化学方法鉴定化合物的结构.结果 从贡山三尖杉枝叶95%乙醇提取物中分离得到11个倍半萜类化合物,分别鉴定为贡山三尖杉倍半萜A(1)、贡山三尖杉倍半萜B(2)、贡山三尖杉倍半萜C(3)、9-hydroxy-4,7-megastigmadien-3-one(4)、corchoionol C(5)、9,10-dihydroxy-4,7-megastigmadien-3-one(6)、5,12-epoxy-9-hydroxy-7-megastigmen-3-one(7)、5,12-epoxy-6,9-hydroxy-7-megastigmen-3-one(8)、loliolide(9)、(3S,5R,8S)- 5,8-epoxy-6-megastigmadien-3,9-diol(10)、clovandiol(11).结论 化合物1为未见文献报道的新化合物,2、3为2个尚未命名的新的天然产物,4～11均为首次从该种植物中分离得到.

Objective To isolate and identify the chemical constituents from the branches and leaves of Cephalotaxus lanceolata. Methods The compounds were separated and purified by column chromatography with silica gel, Sephadex LH-20, MPLC, and HPLC. Their structures were elucidated on the basis of spectroscopic methods. Results Eleven sesquiterpenoids were isolated from 95% ethanol extract of the branches and leaves of C. lanceolata and identified as lanceoloside A (1), lanceoloside B (2), lanceoloside C (3), 9-hydroxy-4,7-megastigmadien-3-one (4), corchoionol C (5), 9,10-dihydroxy-4,7-megastigmadien-3-one (6), 5,12-epoxy-9- hydroxy-7-megastigmen-3-one (7), 5,12-epoxy-6,9-hydroxy-7-megastigmen-3-one (8), loliolide (9), (3S,5R,8S)-5,8-epoxy-6- megastigmadien-3,9-diol (10), and clovandiol (11) respectively. Conclusion Compounds 1 is identified as a new sesquiterpenoid, while compounds 2—3 are two new natural products. Compounds 4—11 are isolated from this plant for the first time.